At this point, If you were looking to buy your friends bike, I would just keep and run that and hang onto your original for spare parts.
Break it down and shove it in a closet somewhere?
But as WilliamTech stated, most of the internal components probably wouldn't need replaced. You'd be looking at the gaskets, the most expensive of which are the head gaskets, and valve cover gaskets. (which might not even need replaced if your careful to put them back on the same head)
The balance dampers should definitely get replaced. As well as a handful of washers and o-rings.
......I'd rather wake up in the middle of nowhere then in any city on earth.
*2014 VN900 Custom (16,200 miles and counting)
Last edited by Ndr; 05-28-2014 at 12:55 AM.